Detection and evaluation of thermal aging brittleness of heat-resistant steel using magneto-acoustic compound techniques

ABSTRACT

The service life and structural safety of components are affected by the thermal ageing of materials; therefore, a non-destructive evaluation of materials is extremely essential and crucial. In this work, heat-resistant steel Cr12MoV was selected as a specimen, and the embrittlement period of heat-resistant steel Cr12MoV was obtained by accelerated thermal ageing experiments. The effects of service temperature and service time on the mechanical properties of heat-resistant steel were analysed. The non-destructive testing of heat-resistant steel was carried out by using magneto-acoustic compound detection techniques based on electromagnetic acoustic transducers. In the process, magneto-acoustic compound detection signals were decoupled. The electromagnetic characteristic parameters and ultrasonic characteristic parameters of the detection signals were extracted to evaluate the mechanical properties and thermal ageing of heat-resistant steel. The quantitative evaluation ability of thermal ageing brittleness of heat-resistant steel was improved by using the magneto-acoustic compound detection techniques compared with single eddy current detection method or single ultrasonic detection method.

KEYWORDS:

• Electromagnetic acoustic transducer
• Ultrasonic waves
• Eddy current
• Magneto-acoustic compound
• Nondestructive evaluation

Acknowledgments

This study was supported by the National Natural Science Foundation of China (grant nos. 12172015 and 11772014).

Disclosure statement

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Notes

1. In Fig. 19(e), ”Eddy current” and ”slope” should be in one line.